1. SAYING NUMBERS & MATHEMATICAL FORMULAS

2. NUMBERS Group 1 written said 1,011 one thousand eleven
     
21,011   twenty-one thousand eleven
721,011  seven hundred twenty-one thousand eleven

3. Group 2
written   said
1,256,721 one million two hundred fifty six thousand seven hundred twenty-one
     
31,256,721  thirty-one million two hundred fifty-six thousand seven hundred twenty-one
631,256,721   six hundred thirty-one million two hundred fifty-six thousand seven hundred twenty-one

4. HUNDRED, THOUSAND, MILLION, BILLION, TRILLION
Group 3
written   said
1,492,638,526   one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six
     
41,492,638,526  forty-one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six
941,492,638,526  nine hundred forty-one billion four hundred ninety-two million six hundred thirty-eight thousand five hundred twenty-six

5. DECIMALS
2.36=>two point three six

6. PERCENTAGES
37%=>thirty seven percent

7. FRACTIONS NUMERATOR-DENOMINATOR
Read the top number as a cardinal number, followed by the ordinal number + ‘s’
3/8=>three eighths
NOTE:
¼ =>one quarter, 2/3 => two thirds, ½ one half

8. EXPRESSIONS HERE ARE THE DESCRIPTIVE NAMES OF A NUMBER OF IMPORTANT NUMERICAL EXPRESSIONS:
speed 100 mph (miles per hour) 
weight 80 kg (kilograms) OR 42 lbs (pounds)
telephone number 
decimal .087
date 12/04/65
percentage 75%
temperature 28° C (celsius) or 7° F (fahrenheit)
height 1 m 89 cm
price $60
fraction 8/13
score 2-1

9. “0” HAS SEVERAL OTHER NAMES, DEPENDING ON CONTEXT
zero: formal scientific usage
naught / nought: mostly British often in decimals
oh: used when spelling numbers (like telephone, bank account, bus
nil: in general sport scores, British usage ("The score is two–nil.")
nothing: in general sport scores, American usage ("The score is two–nothing.")
null: used technically to refer to an object or idea related to nothingness.
love: in tennis, badminton, squash and similar sports

10. x+1 x plus one
x-1 x minus one
x±1 x plus or minus one
xy xy / x multiplied by y
x:y divided by
(x-y)(x+y) x minus y, x plus y
= the equals sign
x=5 x equals 5 / x is equal to 5
x≠5 x (is) not equal to 5
x≡y x is equivalent to (or identical with) y
x>y x is greater than y
x≥y x is greater than or equal to y
x<y x is less than y
x≤y x is less than or equal to y

11. 0<x<1 zero is less than x is less than 1
0≤x≤1 zero is less than or equal to x is less than or equal to 1
x2  x squared / x (raised) to the power 2
x3  x cubed
x4  x to the fourth / x to the power 4
xn  x to the nth / x to the power n
x (−n) x to the (power) minus n
x^2 (square) root x / the square root of x
x^3 cube root (of) x
x^4 fourth root (of) x
x^n nth root (of) x
(x+y)2 x plus y all squared